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President Michel Temer’s move comes as congress prepares to vote on anticorruption measures

By

Paulo Trevisani

Updated Nov. 27, 2016 1:44 p.m. ET

BRASÍLIA—Under pressure from an angry public fed up with corruption, Brazil’s President Michel Temer on Sunday vowed to derail efforts by the nation’s lawmakers to try to shield themselves from prosecution in an epic graft probe that has rocked the country.

Brazil’s congress is set this week to vote on legislation that critics say could grant amnesty to politicians who had taken campaign contributions from an illegal slush fund made...